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avcodec/mjpegdec: decode only SOF fields when finding stream info

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When called from avformat_find_stream_info(), we are only interested in
decoding SOF fields.

This patch makes the decoder skip all other fields (including SOI, SOS,
and EOI). This also prevents the decoder from incorrectly printing the
warning "EOI missing, emulating" (which is the case since 2ae82788).

Fixes: #20119
This commit is contained in:
Ramiro Polla
2025-08-11 18:32:45 +02:00
committed by James Almer
parent f610b55525
commit 5733e08c97
1 changed files with 13 additions and 12 deletions
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25
libavcodec/mjpegdec.c
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@@ -2463,9 +2463,6 @@ redo_for_pal8:
case SOF2:
case SOF3:
case SOF48:
case SOI:
case SOS:
case EOI:
break;
default:
goto skip;
@@ -2541,7 +2538,7 @@ FF_ENABLE_DEPRECATION_WARNINGS
break;
case EOI:
eoi_parser:
if (!avctx->hwaccel && avctx->skip_frame != AVDISCARD_ALL &&
if (!avctx->hwaccel &&
s->progressive && s->cur_scan && s->got_picture)
mjpeg_idct_scan_progressive_ac(s);
s->cur_scan = 0;
@@ -2556,10 +2553,6 @@ eoi_parser:
if (s->bottom_field == !s->interlace_polarity)
break;
}
if (avctx->skip_frame == AVDISCARD_ALL) {
s->got_picture = 0;
goto the_end_no_picture;
}
if (avctx->hwaccel) {
ret = FF_HW_SIMPLE_CALL(avctx, end_frame);
if (ret < 0)
@@ -2588,10 +2581,6 @@ eoi_parser:
s->raw_scan_buffer_size = buf_end - buf_ptr;
s->cur_scan++;
if (avctx->skip_frame == AVDISCARD_ALL) {
skip_bits(&s->gb, get_bits_left(&s->gb));
break;
}
if ((ret = ff_mjpeg_decode_sos(s, NULL, 0, NULL)) < 0 &&
(avctx->err_recognition & AV_EF_EXPLODE))
@@ -2616,6 +2605,18 @@ eoi_parser:
break;
}
if (avctx->skip_frame == AVDISCARD_ALL) {
switch(start_code) {
case SOF0:
case SOF1:
case SOF2:
case SOF3:
case SOF48:
s->got_picture = 0;
goto the_end_no_picture;
}
}
skip:
/* eof process start code */
buf_ptr += (get_bits_count(&s->gb) + 7) / 8;